Add CI task to verify peer connectivity

[rootulp]

Context

There are several open PRs that add/remove/modify a peer address in peers.txt. Examples:

1. Change of peer Cumulo #525
2. Updating Spidey Peer after migrating Validator node due to hardware issues. #524
3. Update peer #521
4. Add W3 to peers. #519
5. Add kjnodes seed and peer node #509
6. Add AM Solutions seed #508
7. Adding figment's peer #507

Problem

It's not immediately obvious how to verify the correctness of these PRs

Proposal

Add a CI check that verifies if a peer is accessible and running on the network that corresponds to the peers.txt that was modified in the PR.